So here's the problem with this BPS. When the slide release button is pressed it pumps as it should. Dry fire the gun, and try to pump and let's hope you're a regular at the gym. It becomes almost impossible to cycle. The colder it gets the harder it is to do. Doesn't matter what size or type of shells are used in it either. The problem occurs loaded or dry fired. Any help would be appreciated. The chamber has been cleaned with a brass brush as we thought this was the problem but no luck....it was worth a try but it won't cycle smoothly even when dry fired.